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Hatch predictions for 300+ US rivers — built from live water & weather, then confirmed against real fly-shop reports.

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Third Creek near Crystal Bay

Third Creek · Sierra / West · USGS gage 10336698

Coldwater (summer mean 13.6°C — prime coldwater).

Water
33°F
Flow
3 cfs
Air
51°F
Sky
0%
Pressure
29.85 in
Wind
4 mph
Predicted hatches · 2026-06-20
PredictedMidgeChironomidae0.20
water 0.4°C (33°F) is warming toward the prime band (1-10°C); shoulder of the season; watch midday, especially cold months.
flies: Zebra Midge #18-22, Griffith's Gnat, Disco Midge

PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.